<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 流年 <liu21st@gmail.com>
// +----------------------------------------------------------------------

// 应用公共文件
/**
 * 创建uuid，系统内唯一标识符
 * @return string
 */
if (!function_exists('uuid')) {
    function uuid()
    {
        mt_srand((double) microtime() * 10000); //optional for php 4.2.0 and up.
        $charid = strtolower(md5(uniqid(rand(), true)));
        $hyphen = chr(45); // "-"
        $uuid = substr($charid, 0, 8) . $hyphen
            . substr($charid, 8, 4) . $hyphen
            . substr($charid, 12, 4) . $hyphen
            . substr($charid, 16, 4) . $hyphen
            . substr($charid, 20, 12);
        return $uuid;
    }
}

